"Believe me... those rehearsals I will remember to my dying day," Kennedy said on the most recent episode of VH1 Classic's 'That Metal Show.' "When we’re talking about this it seems completely ridiculous — there's no way — but it did happen. We played ‘The Rain Song,’ which is probably my favorite Led Zeppelin song, ‘No Quarter,’ ‘Kashmir,’ it was a lot of fun."

"But it wasn’t going to be 'Led Zeppelin,'" Kennedy says of the unrealized collaboration, which began with a one-day session in June 2008 and resumed a few months later. Jones and Page were looking for a way to keep performing together following Led Zeppelin's triumphant one-off December 2007 reunion show, with lead singer Robert Plant preferring to continue pursuing his solo career instead. "I don’t know if they knew what it was going to be. They just wanted to play, they wanted to jam, they wanted to put a project of some sort together. They weren’t sure what it was, but it was never going to be Led Zeppelin with a new singer, I mean, obviously.”

In a 2012 interview with Rolling Stone, Page explains that he resisted the urge to to hit the road with Jones and drummer Jason Bonham without a full-time singer and new material. "I could see what way it was going. Various people thought we should go on tour. I thought we needed a good, credible album, not do something that sounded like we were trying to milk the O2 [Arena, site of the Zeppelin reunion]."

Aerosmith frontman Steven Tyler jammed with Jones and Page around this time, but in 2011 he told Howard Stern that when "it came time for [Jimmy] to say, 'You want to write a record with me?' I went, 'No.' I'm in Aerosmith. He's in the biggest band in the world and I'm in a band like that. I have such an allegiance to my band and I love it so much."